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• casement
  casement

  noun

  a window sash opening on hinges that are generally attached to the upright side of its frame.
• Casement
  Casement

  noun

  (Sir) Roger (David), 1864–1916, Irish patriot: hanged by the British for treason.

casement

¹ American  

[kays-muhnt] / ˈkeɪs mənt /

noun

1. a window sash opening on hinges that are generally attached to the upright side of its frame.

2. Also called casement window. a window with such a sash or sashes.

3. a casing or covering.

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Casement ² American  

[kays-muhnt] / ˈkeɪs mənt /

noun

1. (Sir) Roger (David), 1864–1916, Irish patriot: hanged by the British for treason.

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casement ¹ British  

/ ˈkeɪsmənt /

noun

1. a window frame that is hinged on one side

2. a window containing frames hinged at the side or at the top or bottom

3. a poetic word for window

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Casement ² British  

/ ˈkeɪsmənt /

noun

1. Sir Roger ( David ). 1864–1916, British diplomat and Irish nationalist: hanged by the British for treason in attempting to gain German support for Irish independence

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Other Word Forms

• casemented
  adjective

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Etymology

Origin of casement

1375–1425; late Middle English. See case ², -ment

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Explanation

A casement is a type of window that swings open on a hinge, like a door. Open the casements in the kitchen and let the breeze come in! Before the invention of the sash window, which slides up and down, casements were very common. Today, you're more likely to see casement windows in European homes than in the U.S. Extremely old houses, especially those built before the 17th century, commonly have casement windows with leaded glass panes. Experts guess that the word casement comes from the Old French enchassement, "window frame."

Example Sentences

See Examples For:

casement Casement

It also comes complete with two staircases, window seats, and casement windows.

From MarketWatch ● Jun. 26, 2026

The casement windows on the second floor were probably added in the 1920s — casement windows became popular then — and those very large ground-floor picture windows came later.

From New York Times ● Nov. 21, 2022

"When it struck the quarters, the whole room shook and then the joy of somebody coming in, opening the casement, putting the rod in and winding it up," she said.

From BBC ● Feb. 20, 2022

“We added casement windows with screens so that it could be a four-season porch and we could enjoy it all year long,” said Baudoin.

From Seattle Times ● Jul. 6, 2021

Roy Lee made three-by-five cards for each nozzle, nose cone, and casement, with a description of its dimensions and function.

From "October Sky" by Homer Hickam

If successful, it would be the second time Casement will have been exhumed and reburied.

From BBC ● Oct. 22, 2026

On Thursday night, the association and McCarry gathered at the Casement Social Club in Belfast alongside their legal team, Phoenix Law solicitors, and O'Neill's Funeral Directors.

From BBC ● Oct. 22, 2026

Roger Casement became a household name in Britain and Ireland in the early 20th century.

From BBC ● Oct. 22, 2026

Other flagship policies including the redevelopment of Casement Park and the A5 road project also remain mothballed due to financial and legal disputes.

From BBC ● Sep. 6, 2026

There were still surprise attacks and counter-strokes, in which cavalry took a part, as is seen from an adventure of the 2nd Irish Fusiliers as told by Lance-Corporal Casement.

From The Irish at the Front by Michael MacDonagh

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